Saw-shell Info

Hey guys, Nathan back again with a few more questions. So I've been reading through a lot of the information posts yet I can't seem to find a lot about Saw-shelled turtles. So I'm wondering if there is any key information about the species I'll need to know as I'll be getting one in a few months. Also are the turtle guides and care sheets about generally all freshwater species or certain ones like the Murrays, Macleays, etc.